ViewSonic P225f Horizontal Shrinks & Expands

[clintonG]

I'm glad I found this newsgroup after using search and finding a topic about
the P225f here [1]. I hope somebody has some insight and can respond.

I am using two monitors with XP Pro SP2 driven by an older ATI adapter. As I
recall -- perhaps incorrectly as I am a burnout ;-) -- I updated the ATI
drivers after first seeing the anomaly but the anomaly persists sporadically
on an irregular basis.

One monitor is a ViewSonic 17 configured as 'monitor 2' and is rock solid
and stable. The other monitor is the ViewSonic P225f configured as 'monitor
1' which for the last six months or so -- again, time flies and may be up to
a year now -- the display shrinks in the horizontal and then re-expands
about 5-20 pixels or so on each side.

This shrinking and expanding occurs sporadically and may not be present on
any given day. Other times, it occurs several times within a given hour and
then stops. Each shrink-expansion is microseconds in duration and may repeat
3-5 times and then stops only to begin again minutes later. Very irregular
and sort in duration is what I'm trying to convey.

I have several white box computers and peripherals getting power through an
old switching power supply I pulled from a PDP-11 I bought an an auction.
That PDP-11 supply has 12 outlets and gets its power from the wall on an
ordinarly residential circuit. No other equipment displays any type of power
anomaly. Besides the two monitors, the PDP-11 serves the 12 volt adapters
for firewall, keyboard/mouse/monitor switch box, and so on. I've run out of
outlets on the PDP-11 device and have a TrippLite power strip plugged into
the PDP-11 device as well.

I'm wondering if the power supply on the P225f is going bad and I'm
wondering if the power supply is going bad if it can be replaced in its
entirety. What is the economic value as opposed to buying a new monitor?
What would a repair do for me?

Finally, I'm wondering if those in the know may know if this anomaly may be
resolved by getting cleaner power to the P225f? Would the use of an APC UPS
for example give me cleaner power?

This is a lot to respond to. I hope somebody can take the time...

<%= Clinton Gallagher

[1]
http://sci.tech-archive.net/Archive/sci.electronics.repair/2004-08/0698.html

 

[me]

This is a lot to respond to. I hope somebody can take the time...

It sounds like a bad monitor.

p.s. how can you see a microsecond event?

 

[Richy]

My generic 17" V773 (Optiquest/Viewsonic) does the exact same thing you
are describing. It rarely occurs and for the most part it doesn't bother
me. Except for that obviously it shouldn't be doing that at all and I
have no idea if it is a symptom of something more serious. (BTW, I have
a totally different kind of set up than do you so I doubt that your set
up is to blame.)

 

[Asimov]

"Richy" bravely wrote to "All" (05 Sep 05 20:45:10)
--- on the heady topic of "Re: ViewSonic P225f Horizontal Shrinks & Expands"

Yes, you both might have a burning yoke socket. The solder quality on
the underside of the socket is sometimes unsatifactory as it leaves
the factory. This problem is similar with the FBK because of the large
pins but one will often see the FBK pins were redone by hand. Not so
often the yoke socket unfortunately and these will burn up eventually.
It can then cause things like a shorted HOT, damaged width circuits,
and even zapped logic circuits sometimes. I saw a hole the size of a
quarted burned in a circuit board around the yoke socket. That one
must have set off the fire alarm. It sure stank to high heaven when I
dug into it.

A*s*i*m*o*v


Ri> From: Richy <[email protected]>
Ri> Xref: core-easynews sci.electronics.repair:341427


Ri> My generic 17" V773 (Optiquest/Viewsonic) does the exact same thing
Ri> you are describing. It rarely occurs and for the most part it doesn't
Ri> bother me. Except for that obviously it shouldn't be doing that at all
Ri> and I have no idea if it is a symptom of something more serious. (BTW,
Ri> I have a totally different kind of set up than do you so I doubt that
Ri> your set up is to blame.)

I'm glad I found this newsgroup after using search and finding a topic about
the P225f here [1]. I hope somebody has some insight and can respond.

I am using two monitors with XP Pro SP2 driven by an older ATI adapter. As I
recall -- perhaps incorrectly as I am a burnout ;-) -- I updated the ATI
drivers after first seeing the anomaly but the anomaly persists sporadically
on an irregular basis.

One monitor is a ViewSonic 17 configured as 'monitor 2' and is rock solid
and stable. The other monitor is the ViewSonic P225f configured as 'monitor
1' which for the last six months or so -- again, time flies and may be up to
a year now -- the display shrinks in the horizontal and then re-expands
about 5-20 pixels or so on each side.

This shrinking and expanding occurs sporadically and may not be present on
any given day. Other times, it occurs several times within a given hour and
then stops. Each shrink-expansion is microseconds in duration and may repeat
3-5 times and then stops only to begin again minutes later. Very irregular
and sort in duration is what I'm trying to convey.

I have several white box computers and peripherals getting power through an
old switching power supply I pulled from a PDP-11 I bought an an auction.
That PDP-11 supply has 12 outlets and gets its power from the wall on an
ordinarly residential circuit. No other equipment displays any type of power
anomaly. Besides the two monitors, the PDP-11 serves the 12 volt adapters
for firewall, keyboard/mouse/monitor switch box, and so on. I've run out of
outlets on the PDP-11 device and have a TrippLite power strip plugged into
the PDP-11 device as well.

I'm wondering if the power supply on the P225f is going bad and I'm
wondering if the power supply is going bad if it can be replaced in its
entirety. What is the economic value as opposed to buying a new monitor?
What would a repair do for me?

Finally, I'm wondering if those in the know may know if this anomaly may be
resolved by getting cleaner power to the P225f? Would the use of an APC UPS
for example give me cleaner power?

This is a lot to respond to. I hope somebody can take the time...

<%= Clinton Gallagher

[1]
http://sci.tech-archive.net/Archive/sci.electronics.repair/2004-08/0698.html

.... You mean 15" sparks are SUPPOSED to come out of this thing?!?